Torsional strength detection device for gas meter upper housing interface

Abstract

The utility model relates to gas meter manufacturing technical field, concretely relates to a kind of torsional strength detection device of gas meter upper shell interface, including the clamping structure for clamping upper shell interface, the load applying structure that is applied torsional load to clamping structure, two groups are provided to clamping structure corresponding two upper shell interfaces of gas meter upper shell, including clamping cylinder, clamping linkage assembly, clamping linkage assembly is installed in mounting plate frame;Load applying structure includes torsional cylinder and the torsional linkage assembly of symmetrical arrangement, torsional linkage assembly is connected with torsional cylinder, simultaneously still respectively through two torsional connecting pieces and the mounting plate frame of two clamping structures connection, torsional linkage assembly linear thrust of piston rod is converted into the rotational thrust to mounting plate frame.The response speed of load applying structure and clamping structure in the utility model are faster, improve torsional strength detection efficiency at upper shell interface, and the component structure of each other is simple, and the cooperation precision is lower, so that maintenance cost is also lower.

Description

Technical Field

[0001] This utility model relates to the field of gas meter manufacturing technology, specifically to a torsional strength testing device for the interface of the upper shell of a gas meter. Background Technology

[0002] The connection quality between the gas meter's upper casing and the interface directly affects the overall performance and lifespan of the gas meter. After the gas meter casing is manufactured, to ensure the connection quality at the interface, the gas meter needs to undergo strength testing, one aspect of which is torsional strength. CN116990152A discloses a multi-functional gas meter testing device that uses a nut fitted onto the interface of the gas meter's upper casing. A gear and rack structure is then fitted onto the outer wall of the nut. By driving the gear and rack, a torsional load is applied to the nut, which then transmits this load to the interface, thus achieving the torsional strength test of the interface.

[0003] In the above solution, when applying torsional load with the nut, the nut may continue to tighten along the thread of the interface, potentially causing the two parts to seize up and become difficult to disassemble. Therefore, the nut can be replaced with a direct clamping structure to improve the torsional detection efficiency of the gas meter's upper casing at the interface. This clamping structure typically has paired clamping parts, which are generally long rods. In this case, it is necessary to drive the long rod-shaped clamping parts to rotate. If a gear and rack are still used as the driving force, other structures usually need to be added, which complicates the structure and increases costs. Furthermore, the gear and rack structure itself has high fitting precision, and after long-term use, the tooth surface is prone to wear, requiring the replacement of the entire gear or rack, resulting in high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a torsional strength testing device for the upper shell interface of a gas meter. This device uses a clamping structure to hold the upper shell interface and then uses a load-applying structure to apply a torsional load to the clamping structure. The clamping structure then transfers the torsional load to the upper shell interface, thereby enabling the torsional strength testing of the upper shell of the gas meter at the upper shell interface.

[0005] To solve the above problems, the present invention adopts the following solution: A torsional strength testing device for the upper shell interface of a gas meter includes a clamping structure for clamping the upper shell interface and a load applying structure for applying a torsional load to the clamping structure. The clamping structure is provided in two sets corresponding to the two upper shell interfaces of the gas meter, including a clamping cylinder and a clamping linkage assembly. The clamping linkage assembly is mounted on a mounting plate frame. The clamping linkage assembly is further provided with a pressing clamping assembly to further enhance the clamping degree and reduce damage to the threads of the upper shell interface. The load applying structure includes a torsional cylinder and symmetrically arranged torsional linkage assemblies. The torsional linkage assemblies are connected to the piston rod of the torsional cylinder and are also connected to the mounting plates of the two clamping structures through two torsional connectors. The connection part of the torsional connectors to the mounting plates frame is away from the upper shell interface. The torsional linkage assembly converts the linear thrust of the piston rod into a rotational thrust on the mounting plate frame and transmits the rotational thrust to the upper shell interface through the clamping structure to realize the torsional strength test of the upper shell of the gas meter at the upper shell interface.

[0006] Preferably, the clamping linkage assembly includes a wedge-shaped push block connected to the clamping cylinder and two clamping members that abut against the two symmetrical inclined surfaces of the wedge-shaped push block. The clamping members are rotatably hinged relative to the mounting plate frame and have an arc-shaped clamping part near the upper shell interface. The arc-shaped inner wall of the arc-shaped clamping part corresponding to the upper shell interface is provided with anti-slip grooves. A return spring is also provided between the two clamping members to return to the initial state and release the upper shell interface.

[0007] Using the aforementioned clamping linkage assembly, when the upper shell interface needs to be clamped, the clamping cylinder can push the wedge-shaped push block to move, causing its upper inclined surface to push the two clamping parts to rotate inward, while compressing the return spring, so that the arc-shaped clamping part clamps the outer wall of the upper shell interface; when it is necessary to release the upper shell interface, the clamping cylinder is driven in the opposite direction to pull the wedge-shaped push block back, releasing the force on the clamping parts, so that the two clamping parts gradually open and return to their original state under the action of the return spring, thereby releasing the upper shell interface.

[0008] Preferably, the torsional linkage assembly includes a connecting plate frame connected to the torsional cylinder, two push rods hinged to the connecting plate frame, and two push seats hinged to the two push rods respectively. The ends of the two push seats are respectively hinged to the two torsional connecting parts with a gap. The lower ends of the two push seats are slidably connected to the slide rail on the fixed pressure plate. The fixed pressure plate is a component used to press the interface of the gas meter upper shell during positioning and installation.

[0009] Using this torsional linkage assembly, when a torsional load is to be applied, the torsional cylinder can be activated, causing the piston rod on it to extend and drive the push rod to rotate through the connecting plate frame. The push rod drives the push seat to move linearly along the slide rail. The push seat then pushes the clamping structure to rotate around the center line through the torsional connector, and the arc-shaped clamping part then transmits the torsional load to the upper shell interface, thereby realizing the torsional strength detection of the upper shell interface.

[0010] Preferably, the mounting plate is provided with support and stabilization holes, which are coaxially arranged with the upper shell interface and are used to make a rotatable connection with the fixed pressure plate.

[0011] Therefore, the clamping structure can rotate around the rotation centerline under the push of the load-bearing structure, which improves the torsional stability of the clamping structure and ensures the accuracy and reliability of torsional strength testing.

[0012] Preferably, the inner wall of the arc-shaped clamping part is provided with a rubber pad, and the anti-slip groove is provided on the rubber pad.

[0013] Adding a rubber pad increases the friction between the arc-shaped clamping part and the upper shell interface, thereby further improving the clamping stability. In addition, the clamping part is usually located at the thread of the upper shell interface, and the rubber pad can reduce the damage of this clamping structure to the threads of the upper shell interface.

[0014] Preferably, the clamping assembly is provided with two sets of clamping members respectively, and the clamping assembly is engaged with the torsion groove on the outer wall of the boss of the upper shell interface.

[0015] The above configuration increases the connection between the clamping structure and the upper shell interface, allowing the torsional load to be evenly distributed on the upper shell interface, avoiding stress concentration. It also prevents the load applied to the clamping structure from being transmitted only to the threaded part of the upper shell interface, thus reducing damage to the threads.

[0016] Preferably, the clamping assembly includes an L-shaped sliding clamping member, a guide plate for guiding the sliding clamping member downward, and a recovery assembly for allowing the sliding clamping member to move upward and return to its initial state after disengaging from the guide plate; wherein, the sliding clamping member includes a sliding plate slidably connected to the outer wall of the arc-shaped clamping part, and a clamping plate vertically connected to the lower part of the sliding plate, the sliding plate having an abutting inclined surface, and the clamping plate having a protruding end that can be separably engaged with the torsion groove; the guide plate has a guide inclined surface on its outer side that can be separably abutted against the abutting inclined surface.

[0017] Preferably, the restoration component adopts the principle of magnetism, so that both the arc-shaped clamping part and the clamping plate are magnetic and can attract each other. Furthermore, the force exerted by the guide plate on the sliding clamping part when it abuts is greater than the magnetic attraction between the two. At the same time, the maximum distance between the arc-shaped clamping part and the clamping plate is within the magnetic attraction range of the two.

[0018] Therefore, when the sliding clamping part disengages from the guide plate, the arc-shaped clamping part can attract the clamping plate to move upward through magnetic attraction, thereby resetting the initial state.

[0019] Preferably, the longitudinal sliding connection of the sliding plate is achieved through the waist-shaped hole provided thereon and the limiting shaft of the side wall of the arc-shaped clamping part.

[0020] Preferably, the contact portion between the protruding end and the torsion groove is located outside the contact portion between the arc-shaped clamping part and the upper shell interface, and when the upper shell interface is clamped, the contact pressure of the former two is greater than the contact pressure of the latter two.

[0021] This structure ensures that the contact pressure between the arc-shaped clamping part and the upper shell interface is always less than the contact pressure between the protruding end and the torsion groove. Therefore, it can be ensured that the part of the upper shell interface that bears more force is located at the boss, which can reduce the damage to the threaded part of the upper shell interface. Furthermore, by controlling the pushing stroke of the clamping cylinder, the contact between the arc-shaped clamping part and the upper shell interface is made into a low-pressure contact, which further reduces the damage to the threaded part of the upper shell interface. At the same time, it ensures that the force-bearing area of ​​the upper shell interface is sufficient, the stress of the upper shell interface is evenly distributed, and the clamping is stable and reliable.

[0022] The beneficial effects of this utility model are as follows: In this invention, the load application structure employs a cylinder and a torsion linkage assembly based on a linkage mechanism. Compared to a gear and rack structure, this load application structure has a faster response speed. It also utilizes a direct clamping structure, which, compared to connections via nuts, offers faster clamping speed and more convenient operation. Therefore, it improves the efficiency of torsional strength detection at the gas meter's upper casing interface and makes the detection operation more direct and convenient. Furthermore, each component of this load application structure has a simpler structure, resulting in lower maintenance costs.

[0023] This invention adds a clamping assembly, which increases the connection between the clamping structure and the upper shell interface, allowing the torsional load to be evenly distributed on the upper shell interface, avoiding torsional stress concentration. At the same time, it also prevents the load applied to the clamping structure from being transmitted only to the threaded part of the upper shell interface, thus reducing damage to the threaded part of the upper shell interface. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model when it is fitted with the upper shell of the gas meter; Figure 2 This is a schematic diagram of the structure after part of the fixing pressure plate has been removed in this utility model; Figure 3 This is a schematic diagram of the clamping structure in this utility model; Figure 4 for Figure 3 A magnified view of a section at point I; Figure 5 This is a partial structural diagram of the present invention when the upper shell interface is not fully clamped.

[0025] Reference numerals: Gas meter upper shell 01, upper shell interface 02, boss 03, torsion groove 031, clamping structure 10, load application structure 20, clamping cylinder 11, clamping linkage assembly 12, mounting plate frame 13, torsion cylinder 21, torsion linkage assembly 22, torsion connector 23, wedge push block 121, clamping component 122, return spring 123, support stabilizing hole 131, arc-shaped clamping part 1221, anti-slip groove 1222, connecting plate frame 221, push rod 222, push seat 223, slide rail 224, fixed pressure plate 30, tight clamping assembly 40, sliding clamping component 41, guide plate 42, sliding plate 411, clamping plate 412, abutting slope 4111, protruding end 4121, guide slope 421, waist-shaped hole 51, limiting shaft 52. Detailed Implementation Example

[0026] This embodiment provides a torsional strength testing device for the upper shell interface of a gas meter, which is used to detect the torsional strength of the upper shell of the gas meter at the interface. The device clamps the upper shell interface through a clamping structure 10, and then applies a torsional load to the clamping structure 10 using a load applying structure 20. The clamping structure 10 transmits the torsional load to the upper shell interface, thereby realizing the torsional strength detection of the upper shell 01 of the gas meter at the upper shell interface 02.

[0027] refer to Figure 1 The torsional strength testing device includes a clamping structure 10 and a load application structure 20, wherein: refer to Figure 1 , Figure 2 The clamping structure 10 has two sets of upper shell interfaces 02 corresponding to the two upper shell interfaces 02 of the gas meter upper shell 01, as shown in the reference. Figure 3 It includes a clamping cylinder 11 and a clamping linkage assembly 12, wherein the clamping linkage assembly 12 serves as the clamping execution component and is mounted on the mounting plate frame 13. The clamping linkage assembly 12 includes a wedge-shaped push block 121 connected to the clamping cylinder 11 and two clamping members 122 respectively abutting against the two symmetrical inclined surfaces of the wedge-shaped push block 121. The clamping members 122 are rotatably hinged relative to the mounting plate frame 13 and have an arc-shaped clamping part 1221 near the upper shell interface. The arc-shaped inner wall of the arc-shaped clamping part 1221 corresponding to the upper shell interface is provided with an anti-slip groove 1222. A return spring 123 is also provided between the two clamping members 122 to enable the two clamping members 122 to return to the initial state and release the upper shell interface. refer to Figure 2The load application structure 20 includes a torsion cylinder 21 and a symmetrically arranged torsion linkage assembly 22. The torsion linkage assembly 22 is connected to the piston rod of the torsion cylinder 21, and is also hinged to the mounting plate frame 13 of the two clamping structures 10 through two torsion connectors 23. The hinged part is away from the side of the arc-shaped clamping part 1221. The torsion linkage assembly 22 converts the linear thrust of the piston rod into a rotational thrust on the mounting plate frame 13, thereby pushing the clamping structure 10 to twist with the arc-shaped clamping part 1221 as the fixed point, so as to realize the torsional strength test of the gas meter upper shell 01 at the upper shell interface 02.

[0028] Specifically, refer to Figure 2 The torsional linkage assembly 22 includes a connecting plate frame 221 connected to the torsional cylinder 21, two push rods 222 hinged to the connecting plate frame 221, and two push seats 223 hinged to the two push rods 222 respectively. The ends of the two push seats 223 are respectively hinged to the two torsional connectors 23 with a gap (here, it needs to be explained that the hole position of the hinge has a shape and size that allows for the movement space required for the torsional connector to swing). The lower ends of the two push seats 223 are slidably connected to the slide rail 224 on the fixed pressure plate 30. The fixed pressure plate 30 is a plate used to press and fix the upper shell interface 02 when the gas meter upper shell 01 is positioned and installed (the positioning and installation device of the gas meter upper shell is not shown in the figure, only the part of the structure including the fixed pressure plate is shown). It can be understood that in order to complete the swing of the torsional connector 23, the relevant hinge positions of the torsional linkage assembly 22 can be adaptively adjusted to require the movement space.

[0029] With the above structure, this embodiment can complete the torsional strength test of the gas meter upper shell 01 at the upper shell interface 02. The test process is as follows: First, the upper shell interface 02 is clamped by the clamping structure 10. Specifically, the wedge-shaped pusher 121 is moved by the clamping cylinder 11, so that its upper inclined surface pushes the two clamping parts 122 to rotate inward, while compressing the return spring 123, so that the arc-shaped clamping part 1221 clamps the outer wall of the upper shell interface. Then, the load-applying structure 20 applies a torsional load to the clamping structure 10. Specifically, the torsion cylinder 21 is activated, causing its piston rod to extend and drive the push rod 222 to rotate via the connecting plate frame 221. The push rod 222 drives the push seat 223 to move linearly along the slide rail 224. At the same time, the push seat 223 also pushes the clamping structure 10 to rotate around the rotation centerline through the torsion connector 23 (this rotation centerline refers to the...). Figure 4 (The center line is drawn at the support stabilizing hole 131). The arc-shaped clamping part 1221 then transmits the torsional load to the upper shell interface 02, thereby realizing the torsional strength detection of the upper shell interface 02. After the test is completed, the torsion cylinder 21 is started in reverse, causing its piston rod to retract and drive the torsion linkage component 22 to move in reverse until it returns to the initial state; then the clamping cylinder 11 is driven in reverse to pull back the wedge push block 121, releasing the force on the clamping member 122, so that the two clamping members 122 gradually open and return to their original state under the action of the return spring 123, thereby releasing the upper shell interface 02.

[0030] In this implementation, the pass standard for torsional strength testing at the upper casing interface 02 of the gas meter upper casing 01 is as follows: Based on the torsional strength standard at the connection point of the gas meter upper shell 01 and upper shell interface 02, the thrust of the torsional cylinder 21 is preset in advance, and the pushing stroke of the torsional cylinder 21 under the corresponding qualified strength standard is calculated. If the torsional strength at the connection point of the upper shell interface 02 meets the qualified standard, the actual pushing stroke of the torsional cylinder 21 should be less than or equal to the standard stroke. If the strength is not qualified, the actual pushing stroke of the torsional cylinder 21 should be greater than the standard stroke. The pushing stroke of the cylinder can be measured by displacement sensor, visual inspection, etc.

[0031] Further, refer to Figure 2 , Figure 4 The mounting plate 13 is provided with a support and stabilization hole 131, which is coaxial with the upper shell interface 02 and is used to rotatably connect with the fixed pressure plate 30. Therefore, the clamping structure 10 can rotate around the rotation center line under the push of the load application structure 20, which improves the torsional stability of the clamping structure 10 and ensures the accuracy and reliability of the torsional strength test.

[0032] To further improve clamping stability, a rubber pad (not shown in the figure) can be added to the arc-shaped inner wall of the arc-shaped clamping part 1221, and an anti-slip groove 1222 is provided on the rubber pad.

[0033] To ensure sufficient clamping area and reliable clamping at the upper shell interface, the arc-shaped clamping part 1221 is typically clamped at the threaded portion of the upper shell interface. However, when applying load using the clamping structure 10, it may damage the threads of the upper shell interface 02. Therefore, it is advisable to refer to... Figure 2 The clamping structure 10 is further provided with two clamping components 122, and the two clamping components 40 are symmetrically arranged.

[0034] Specifically, refer to Figure 4 , Figure 5The clamping assembly 40 engages with the torsion groove 031 on the outer wall of the boss 03 on the upper shell interface 02 to increase the connection between the clamping structure 10 and the upper shell interface 02, allowing the torsional load to be evenly distributed on the upper shell interface 02, avoiding stress concentration. It also prevents the load applied to the clamping structure 10 from being transmitted only to the threaded portion of the upper shell interface 02, thus reducing damage to the threads. It includes: The sliding clamping member 41 is L-shaped and includes a sliding plate 411 that is slidably connected to the outer wall of the arc-shaped clamping part 1221 and a clamping plate 412 that is vertically connected to the lower part of the sliding plate 411. The sliding plate 411 has an abutting inclined surface 4111 and the clamping plate 412 has a protruding end 4121. The protruding end 4121 can be separably fitted with the torsion groove 031. The guide plate 42 is provided on the mounting plate frame 13 and located above the arc-shaped clamping part 1221. It has a guide slope 421 on its outer side. The guide slope 421 and the abutting slope 4111 can be separated and abutted, which is used to push the sliding clamping part 41 to move downward. The recovery component (not shown in the figure) is used to enable the sliding clamp 41 to automatically move upward to return to its initial state after it is disengaged from the guide plate 42.

[0035] The restoration component uses a magnetic principle, so that both the arc-shaped clamping part 1221 and the clamping plate 412 are magnetic and can attract each other. When the guide plate 42 abuts against the sliding clamping member 41, the force is greater than the magnetic attraction between the two. At the same time, the maximum distance between the arc-shaped clamping part 1221 and the clamping plate 412 is within the magnetic attraction range of the two.

[0036] Therefore, when the sliding clamp 41 is disengaged from the guide plate 42, the arc-shaped clamping part 1221 can attract the clamping plate 412 upward through magnetic attraction, thereby resetting the initial state.

[0037] refer to Figure 5 The longitudinal sliding connection of the sliding plate 411 is achieved through the waist-shaped hole 51 provided thereon and the limiting shaft 52 of the side wall of the arc-shaped clamping part 1221.

[0038] Furthermore, the contact portion of the protruding end 4121 and the torsion groove 031 is located outside the contact portion of the arc-shaped clamping part 1221 and the upper shell interface, and when the upper shell interface 02 is clamped, the contact pressure of the former two is greater than that of the latter two.

[0039] This structure ensures that the contact pressure between the arc-shaped clamping part 1221 and the upper shell interface 02 is always less than the contact pressure between the protruding end 4121 and the torsion groove 031. Therefore, it can be ensured that the part of the upper shell interface 02 that is subjected to greater force is located at the boss 03, which can reduce the damage to the threaded part of the upper shell interface. Furthermore, by controlling the pushing stroke of the clamping cylinder 11, the contact between the arc-shaped clamping part 1221 and the upper shell interface 02 is a low-pressure contact, which further reduces the damage to the threaded part of the upper shell interface. At the same time, it ensures that the force-bearing area of ​​the upper shell interface is sufficient, the stress of the upper shell interface is evenly distributed, and the clamping is stable and reliable.

[0040] Furthermore, to ensure that the clamping plate 412 is in close contact with the boss 03 of the upper shell interface and to guarantee stable load transmission, the clamping plate 412 is arc-shaped and can fit with the outer peripheral wall of the boss 03 of the upper shell interface, with protruding ends 4121 provided at both ends of the arc-shaped clamping plate 412.

[0041] The aforementioned clamping assembly 40 rotates together with the clamping member 122, thus achieving almost synchronous clamping with the arc-shaped clamping part 1221. The clamping process is as follows: When it is necessary to clamp the upper shell interface, the clamping cylinder 11 drives the clamping member 122 to rotate toward the upper shell interface. During this rotation, the clamping member 122 drives the sliding clamping member 41 to rotate toward the boss 03. When the sliding plate 411 abuts the inclined surface 4111 of the sliding plate 411 and the guide inclined surface 421 of the guide plate 42, as the sliding plate 411 continues to rotate, it can move downward along the guide inclined surface 421 of the guide plate 42, and gradually make the clamping plate 412 at the lower part of the sliding plate 411 surround the outer peripheral wall of the boss 03 and embed the protruding end 4121 into the torsion groove 031. When the upper shell interface needs to be released, the directional drive clamping cylinder 11 drives the clamping member 122 to rotate outward. During this process, the clamping member 122 also drives the sliding clamping member 41 to rotate outward, so that the sliding clamping member 41 gradually separates from the guide plate 42. After separation, the arc-shaped clamping part 1221 attracts the clamping plate 412 to move upward through magnetic attraction. The clamping plate 412 moves upward through the waist-shaped hole 51 on the sliding plate 411, thus returning the clamping assembly 40 to its initial state.

Claims

1. A torsional strength testing device for the upper casing interface of a gas meter, comprising a clamping structure (10) for clamping the upper casing interface (02) and a load applying structure (20) for applying a torsional load to the clamping structure (10), characterized in that, The clamping structure (10) is provided with two sets of clamping cylinders (11) and clamping linkage components (12) corresponding to the two upper shell interfaces (02) of the gas meter upper shell (01). The clamping linkage components (12) are mounted on the mounting plate frame (13). The clamping linkage components (12) are also provided with a tight clamping component (40) to further enhance the clamping degree and reduce damage to the threads of the upper shell interface (02). The load applying structure (20) includes a torsion cylinder (21) and a symmetrically arranged torsion linkage component (22). The torsion linkage component (22) and the torsion linkage component (22) are connected to the torsion cylinder (21). The piston rod of the rotary cylinder (21) is connected, and is also connected to the mounting plate frame (13) of the two clamping structures (10) through two torsion connectors (23). The connection part of the torsion connector (23) and the mounting plate frame (13) is away from the upper shell interface (02). The torsion linkage component (22) converts the linear thrust of the piston rod into a rotational thrust on the mounting plate frame (13), and transmits the rotational thrust to the upper shell interface (02) through the clamping structure (10), so as to realize the torsional strength test of the gas meter upper shell (01) at the upper shell interface (02).

2. The torsional strength testing device for the gas meter upper casing interface according to claim 1, characterized in that, The clamping linkage assembly (12) includes a wedge-shaped push block (121) connected to the clamping cylinder (11) and two clamping members (122) that abut against the two symmetrical inclined surfaces of the wedge-shaped push block (121). The clamping member (122) is rotatably hinged relative to the mounting plate frame (13) and has an arc-shaped clamping part (1221) near the upper shell interface (02). The arc-shaped clamping part (1221) and the arc-shaped inner wall corresponding to the upper shell interface (02) are provided with anti-slip grooves (1222). A return spring (123) is also provided between the two clamping members (122).

3. The torsional strength testing device for the gas meter upper casing interface according to claim 1, characterized in that, The torsional linkage assembly (22) includes a connecting plate frame (221) connected to the torsional cylinder (21), two push rods (222) hinged to the connecting plate frame (221), and two push seats (223) hinged to the two push rods (222) respectively. The ends of the two push seats (223) are respectively hinged to the two torsional connectors (23) with a gap. The lower ends of the two push seats (223) are slidably connected to the slide rail (224) on the fixed pressure plate (30). The fixed pressure plate (30) is a component used to press the upper shell interface (02) tightly when the gas meter upper shell (01) is positioned and installed.

4. The torsional strength testing device for the gas meter upper casing interface according to claim 3, characterized in that, The mounting plate frame (13) is provided with a support and stabilization hole (131), which is coaxially arranged with the upper shell interface (02) and is used to make a rotatable connection with the fixed pressure plate (30).

5. The torsional strength testing device for the gas meter upper casing interface according to claim 2, characterized in that, The arc-shaped clamping part (1221) has a rubber pad on its arc-shaped inner wall, and an anti-slip groove (1222) is provided on the rubber pad.

6. The torsional strength testing device for the gas meter upper casing interface according to claim 2, characterized in that, The clamping assembly (40) is provided with two sets of clamping parts (122) respectively, and the clamping assembly (40) cooperates with the torsion groove (031) on the outer wall of the boss (03) opened on the upper shell interface (02).

7. The torsional strength testing device for the gas meter upper casing interface according to claim 6, characterized in that, The clamping assembly (40) includes an L-shaped sliding clamping member (41), a guide plate (42) for pushing the sliding clamping member (41) downward, and a recovery assembly for allowing the sliding clamping member (41) to move upward and return to its initial state after disengaging from the guide plate (42); wherein: The sliding clamp (41) includes a sliding plate (411) slidably connected to the outer wall of the arc-shaped clamping part (1221) and a clamping plate (412) vertically connected to the lower part of the sliding plate (411). The sliding plate (411) has an abutting inclined surface (4111), and the clamping plate (412) has a protruding end (4121). The protruding end (4121) can be separably fitted with the torsion groove (031). The guide plate (42) has a guide inclined surface (421) on its outer side that can be separably abutted against the abutting inclined surface (4111).

8. The torsional strength testing device for the gas meter upper casing interface according to claim 7, characterized in that, The restoration component uses the principle of magnetism, so that the arc-shaped clamping part (1221) and the clamping plate (412) are both magnetic and can attract each other. The force exerted by the guide plate (42) on the sliding clamping part (41) is greater than the magnetic attraction between the two. At the same time, the maximum distance between the arc-shaped clamping part (1221) and the clamping plate (412) is within the magnetic attraction range of the two.

9. The torsional strength testing device for the gas meter upper casing interface according to claim 7, characterized in that, The longitudinal sliding connection of the sliding plate (411) is achieved through the waist-shaped hole (51) provided thereon and the limiting shaft (52) on the side wall of the arc-shaped clamping part (1221).

10. The torsional strength testing device for the gas meter upper casing interface according to claim 7, characterized in that, The contact area between the protruding end (4121) and the torsion groove (031) is located outside the contact area between the arc-shaped clamping part (1221) and the upper shell interface (02), and when the upper shell interface (02) is clamped, the contact pressure of the former two is greater than that of the latter two.

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